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# depends on: array.rb dir.rb env.rb file.rb hash.rb module.rb regexp.rb
# empty gem_prelude.rb
#
# p defined?(Gem)
if defined?(Gem) then
module Kernel
def gem(gem_name, *version_requirements)
Gem.push_gem_version_on_load_path(gem_name, *version_requirements)
end
end
module Gem
ConfigMap = {
:sitedir => RbConfig::CONFIG["sitedir"],
:ruby_version => RbConfig::CONFIG["ruby_version"],
:libdir => RbConfig::CONFIG["libdir"],
:sitelibdir => RbConfig::CONFIG["sitelibdir"],
:arch => RbConfig::CONFIG["arch"],
:bindir => RbConfig::CONFIG["bindir"],
:EXEEXT => RbConfig::CONFIG["EXEEXT"],
:RUBY_SO_NAME => RbConfig::CONFIG["RUBY_SO_NAME"],
:ruby_install_name => RbConfig::CONFIG["ruby_install_name"]
}
class << self
def default_dir
if defined? RUBY_FRAMEWORK_VERSION
return File.join(File.dirname(ConfigMap[:sitedir]), "Gems")
else
File.join(ConfigMap[:libdir], 'ruby', 'gems', ConfigMap[:ruby_version])
end
end
def dir
@gem_home ||= nil
set_home(ENV['GEM_HOME'] || default_dir) unless @gem_home
@gem_home
end
def path
@gem_path ||= nil
unless @gem_path
paths = [ENV['GEM_PATH']]
paths << APPLE_GEM_HOME if defined? APPLE_GEM_HOME
set_paths(paths.compact.join(File::PATH_SEPARATOR))
end
@gem_path
end
# Set the Gem home directory (as reported by +dir+).
def set_home(home)
@gem_home = home
ensure_gem_subdirectories(@gem_home)
end
def set_paths(gpaths)
if gpaths
@gem_path = gpaths.split(File::PATH_SEPARATOR)
@gem_path << Gem.dir
else
@gem_path = [Gem.dir]
end
@gem_path.uniq!
@gem_path.each do |gp| ensure_gem_subdirectories(gp) end
end
def ensure_gem_subdirectories(path)
end
end
module QuickLoader
class << self
def load_full_rubygems_library
class << Gem
Gem.methods(false).each do |method_name|
undef_method method_name
end
end
Kernel.module_eval do
undef_method :gem if method_defined? :gem
end
$".delete File.join(Gem::ConfigMap[:libdir], 'ruby',
Gem::ConfigMap[:ruby_version], 'rubygems.rb')
require 'rubygems'
end
end
GemPaths = {}
GemVersions = {}
def push_gem_version_on_load_path(gem_name, *version_requirements)
if version_requirements.empty?
unless GemPaths.has_key?(gem_name)
raise LoadError.new("Could not find RubyGem #{gem_name} (>= 0)\n")
end
# highest version gems already active
return false
else
if version_requirements.length > 1
QuickLoader.load_full_rubygems_library
return gem(gem_name, *version_requirements)
end
requirement, version = version_requirements[0].split
requirement.strip!
if requirement == ">" || requirement == ">="
if (GemVersions[gem_name] <=> Gem.calculate_integers_for_gem_version(version)) >= 0
return false
end
elsif requirement == "~>"
loaded_version = GemVersions[gem_name]
required_version = Gem.calculate_integers_for_gem_version(version)
if loaded_version && (loaded_version[0] == required_version[0])
return false
end
end
QuickLoader.load_full_rubygems_library
gem(gem_name, *version_requirements)
end
end
def calculate_integers_for_gem_version(gem_version)
numbers = gem_version.split(".").collect {|n| n.to_i}
numbers.pop while numbers.last == 0
numbers << 0 if numbers.empty?
numbers
end
def push_all_highest_version_gems_on_load_path
Gem.path.each do |path|
gems_directory = File.join(path, "gems")
if File.exist?(gems_directory)
Dir.entries(gems_directory).each do |gem_directory_name|
next if gem_directory_name == "." || gem_directory_name == ".."
dash = gem_directory_name.rindex("-")
next if dash.nil?
gem_name = gem_directory_name[0...dash]
current_version = GemVersions[gem_name]
new_version = calculate_integers_for_gem_version(gem_directory_name[dash+1..-1])
if current_version
if (current_version <=> new_version) == -1
GemVersions[gem_name] = new_version
GemPaths[gem_name] = File.join(gems_directory, gem_directory_name)
end
else
GemVersions[gem_name] = new_version
GemPaths[gem_name] = File.join(gems_directory, gem_directory_name)
end
end
end
end
require_paths = []
GemPaths.values.each do |path|
if File.exist?(File.join(path, ".require_paths"))
require_paths.concat(File.read(File.join(path, ".require_paths")).split.map {|require_path| File.join(path, require_path)})
else
require_paths << File.join(path, "bin") if File.exist?(File.join(path, "bin"))
require_paths << File.join(path, "lib") if File.exist?(File.join(path, "lib"))
end
end
# "tag" the first require_path inserted into the $LOAD_PATH to enable
# indexing correctly with rubygems proper when it inserts an explicitly
# gem version
unless require_paths.empty?
require_paths.first.instance_variable_set(:@gem_prelude_index, true)
end
# gem directories must come after -I and ENV['RUBYLIB']
$:[$:.index(ConfigMap[:sitelibdir]),0] = require_paths
end
def const_missing(constant)
QuickLoader.load_full_rubygems_library
if Gem.const_defined?(constant)
Gem.const_get(constant)
else
super
end
end
def method_missing(method, *args, &block)
QuickLoader.load_full_rubygems_library
super unless Gem.respond_to?(method)
Gem.send(method, *args, &block)
end
end
extend QuickLoader
end
begin
Gem.push_all_highest_version_gems_on_load_path
$" << File.join(Gem::ConfigMap[:libdir], "ruby",
Gem::ConfigMap[:ruby_version], "rubygems.rb")
rescue Exception => e
puts "Error loading gem paths on load path in gem_prelude"
puts e
puts e.backtrace.join("\n")
end
end
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